Facebook

App Name – application name which is displayed in the list of Facebook applications (any characters);

App Namespace – name that identifies the address of the application page. For example, if the field if set “pgrealestate”, then the application page URL will look like http://apps.facebook.com/pgrealestate/. If the field is left blank, the page will get a random address.

Web Hosting – you can use a free webhosting for your application. Leave the field unselected if hosting is not required.

Press “Continue” and go through the security check.

Once the security check is passed, you get to the application settings page.